Upright Purple Leaved Norway Maple ACER PLATANOIDES CRIMSON SENTRY

British Grown
Volume 1+
Price per plant £132.00
Price £132.00

All prices include VAT

Product description



This cultivar of Norway Maple is very similar to the better known Acer platanoides ‘Crimson King’. Though they both grow to about the same height of 15m (48ft) there are some noticeable differences. The first of which are the leaves with the crimson sentry being slightly lighter in colour and smaller in size, they also have a more delicate cut edge. The second major difference is the ultimate shape, Crimson Sentry is a lot narrower making it a better choice for avenues, street planting and anywhere that space is tight. 

Where to grow

It requires full sun or light shade and will grow on most soil types, with the exception of overly acidic sandy soils.  This is a very hardy tree that will tolerate a lot of wind. Also a good choice for cities as it copes well with pollution. Sadly one downside to this tree is that it is prone to downy mildew in the late summer.

Did you know?

The wood from Maple trees is often used to smoke meats, fish and cheese. The reason it is used it that it adds a mild smoky, somewhat sweet flavour.

Mature height
Medium - 10-15 metres
0-5 metres
Growth rate
Soil type
Light sandy
Sun levels
Full sun
Partial shade
Difficulty/hard to grow
Season of interest
Large Leaves
Good for Windy sites
Good at altitude
Parkland Tree
Garden Tree
City/Urban Sites


Pruning Acer Platanoides Crimson Sentry

Very little pruning is needed to maintain the tight upright form of Acer platanoides Crimson Sentry. It will naturally keep this shape so the only pruning necessary is to remove damaged or diseased stems. Remove these fully, cutting flush with the main stem. If you wish to prune further, remove new growth and avoid established stems.

What time of year should I prune?  Prune in winter (November to January) when the plant is dormant. Acers will bleed sap if pruned too early.

For the continued healthy growth of your trees, shrubs or hedging it is vital that you follow the advice below.


The main reason that plants die within 12 months of having been planted is lack of water.  It is essential throughout the spring and summer, to give a heavy enough watering to enable the water to penetrate right down to the deepest root level of the tree.  In hot dry spells give the equivalent of 2 bucketfuls every three days.

Weed Control

One of the most common causes of lack of water is competition from grass.  When trees are first establishing, the grass roots would be at the same level as the tree roots and are far more efficient at taking up water and thus choke the tree.  It is vital for 3 years after planting that your tree or hedge has a circle or strip one  metre wide completely free of grass.  The way to eliminate grass in order of effectiveness is:

  1. Spray off the grass with a glyphosate based weed killer such as Roundup.  Apply each year for the first 3 years.  It is best applied when the tree is dormant as it is absorbed through green leaves and kills the plant off at the roots.
  2. Firmly fit a mulch mat around the base of the tree by tucking the edges into the soil and put a thick layer of bark mulch on top of this.  This can be done after the initial spraying with glyphosate and should avoid the need for further spraying.

Mowing or strimming is NOT an answer to the problem.  Each time you mow, the grass will grow back more vigorously and strimming invariably leads to lacerated trunks.


If trees are not correctly secured they will rock in the planting pit. Roots not firmly in contact with the soil are unable to take up moisture and nutrients, resulting in die back or death of the tree.  Check, particularly after windy weather, that stakes are still solidly in the ground keeping the base of the trunk firm.  The purpose of the stakes is to anchor the roots.   Flexing in the wind, higher up the trunk, is not necessarily a problem if the roots are firm.

Bellow is list of the correct system to use to secure your trees.

  • 40/60, 60/80, 80/100 whips - Unless rabbit/deer problem no need to stake.
  • 100/125, 125/150  1.2m Cane and Easi tie.
  • 150/175  1.2m square stake and a buckle tie and spacer.
  • 175/250, 6/8, 8/10 15L 1.65 Tree stake and a buckle tie and spacer.
  • All larger trees. 2 x 1.65 Tree stake and cross rail with 38mm cushion spacer and 1m of 38mm strapping.


Always use our recommended tree ties or strapping.  These are designed and manufactured with the correct amount of give to hold the tree firm without strangling it. They should be checked at the end of each growing season for adjustment as the trunk thickens.  Non proprietary materials such as baler twine will cut into the bark and should not be used.

Protection from Animal Damage

Rabbits, deer, sheep, cattle and horses can all potentially damage trees.  Ask us for advice on the most appropriate guards for your trees or hedge.  Squirrels are also a terrible pest when trees get to about 20ft tall but there is no protection available.


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